(10) विषयों में से (5) विषय चुनने हैं। रसायन अवश्य चुना जाए, जीवविज्ञान न चुना जाए और गणित तथा भौतिकी दोनों साथ में न चुने जाएं। कितने तरीके हैं?
From (10) subjects (5) subjects are to be selected. Chemistry must be selected, biology must not be selected, and mathematics and physics must not both be selected together. How many ways are there?
Explanation opens after your attempt
C. (55)
Concept
Chemistry is fixed and biology is excluded. Choose the remaining (4) subjects from (8) and subtract \(\binom{6}{2}\) selections containing both mathematics and physics to get (55).
Why this answer is correct
The correct answer is C. (55). Chemistry is fixed and biology is excluded. Choose the remaining (4) subjects from (8) and subtract \(\binom{6}{2}\) selections containing both mathematics and physics to get (55).
Exam Tip
रसायन तय और जीवविज्ञान हट गया है। बाकी (4) विषय (8) में से चुनें और गणित-भौतिकी दोनों वाले \(\binom{6}{2}\) चयन घटाएं तो (55) मिलते हैं।
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